/*
 * Copyright [2013-2021], Alibaba Group Holding Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.alibaba.polardbx.executor.pl;

import com.alibaba.polardbx.executor.cursor.Cursor;
import com.alibaba.polardbx.executor.operator.CacheCursor;
import com.alibaba.polardbx.executor.operator.spill.SpillerFactory;
import com.alibaba.polardbx.optimizer.core.row.Row;
import com.alibaba.polardbx.optimizer.memory.MemoryPool;
import com.alibaba.polardbx.optimizer.spill.QuerySpillSpaceMonitor;

public class PlCacheCursor extends CacheCursor {
    boolean openSpillFile = false;

    PlCacheCursor(SpillerFactory spillerFactory, Cursor cursor, MemoryPool pool, long estimateRowSize,
                  QuerySpillSpaceMonitor spillerMonitor) {
        super(spillerFactory, cursor, pool, estimateRowSize, spillerMonitor);
    }

    @Override
    public boolean getIteratorLater() {
        return true;
    }

    public void openSpillFile() {
        if (openSpillFile) {
            return;
        }
        // if spill happened, read the spill file
        if (spiller != null) {
            iterator = getIterator();
        }
        openSpillFile = true;
    }

    @Override
    public Row next() {
        if (spiller != null && !openSpillFile) {
            openSpillFile();
        }
        return super.next();
    }
}
